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Effects of Forest Fertilization on Two Southeast Alaska Streams¹

ABSTRACT

Four streams in southeast Alaska were studied to determine the effects of forest fertilization with urea on basic productivity and water quality.

An initial, short-term increase in ammonia-nitrogen was observed in the treated streams, and nitrate-nitrogen levels increased and remained high compared to control stream levels during the year following treatment. Concentrations did not approach those considered toxic to aquatic life or unsafe for human consumption. Changes in biomass of periphyton and benthic fauna as a result of fertilization were not detected.

Key Words: water quality • primary productivity • nitrogen

¹ Contribution from USDA Forest Service, Pacific Northwest Forest & Range Exp. Sta., Portland, Ore. 97208, and Environmental Protection Agency, Arctic Environmental Research Lab., College, Alaska 99701.

² Fishery Research Biologist, USDA Forest Service, Research Physical Scientist, and Chief of Ecology Research, EPA, respectively.

Received for publication February 1, 1974.

This article has been cited by other articles:

				C. M. Flint, R. B. Harrison, B. D. Strahm, and A. B. Adams Nitrogen Leaching from Douglas-fir Forests after Urea Fertilization J. Environ. Qual., August 8, 2008; 37(5): 1781 - 1788. [Abstract] [Full Text] [PDF]